mojo: first take on removing mojo_main_{chromium,standalone}.

mojo/public/cpp/application/lib/application_runner_chromium.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "mojo/public/cpp/application/application_runner_chromium.h"
+
+#include "base/at_exit.h"
+#include "base/command_line.h"
+#include "base/message_loop/message_loop.h"
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_impl.h"
+
+namespace mojo {
+
+// static
+void ApplicationImpl::Terminate() {
+  if (base::MessageLoop::current()->is_running())
+    base::MessageLoop::current()->Quit();
+}
+
+ApplicationRunnerChromium::ApplicationRunnerChromium()
+    : loop_type_(base::MessageLoop::TYPE_DEFAULT) {}
+
+ApplicationRunnerChromium::~ApplicationRunnerChromium() {}
+
+void ApplicationRunnerChromium::take_delegate(
+    scoped_ptr<ApplicationDelegate> delegate) {
+  DCHECK(!delegate_);
+  DCHECK(delegate);
+  delegate_ = delegate.Pass();
+}
+
+void ApplicationRunnerChromium::set_loop_type(base::MessageLoop::Type type) {
+  DCHECK_EQ(base::MessageLoop::TYPE_DEFAULT, loop_type_);
+  loop_type_ = type;
+}
+
+MojoResult ApplicationRunnerChromium::Run(MojoHandle shell_handle) {
+  base::CommandLine::Init(0, NULL);
+#if !defined(COMPONENT_BUILD)
+  base::AtExitManager at_exit;
+#endif
+
+  {
+    base::MessageLoop loop(loop_type_);
+    ApplicationImpl impl(delegate_.get(),
+        MakeScopedHandle(MessagePipeHandle(shell_handle)));
+    loop.Run();
+  }
+  delegate_.reset();
+  return MOJO_RESULT_OK;
+}
+
+}  // namespace mojo